Chuck



JrF. BUHR.

CHUCK. APPLICATION man SEPT. 5, 191s.-

1,392,f678. Patented oet. 4,1921.

4 SHEETS-SHEET l- J. F'ABUHR,

CHUCK.

APPLICATION FILED SEPTt 5. I9I9.

Patented OGI. 4, 1921*.

4 SHEETS*SHEET 2.

J. F. BUHH,

y CHUCK. APPLICATION FILED SEPT 5| 1919.

- 1,392,678. Patented om 4, 1921.

4 SHEETS-SHEET 3.

J. F. BUHR.

CHUCK.

APPLICATION FILED SEPTx 5, 1919.

Patented Oct. 4, 1921.

-4 SHEETS-SHEET 4.

Parser forties.

JOSEHF. EUHR, 0F DETROIT, MICHIGAN.

. CHUCK. or Y Application mee-september 5,21919. serial Na 351,789.

T 0 all 'whom/t mag/concern l Be itzknown thatI, ifJosEB-H l' F.*'BUHR,'Y= a citizen of the United States offAnierica,`re siding :atDetroit, :inf the county of "-Wayne .and State of V"lVIichigan, haveinvented certain new and useful lmprovements `in Chucks, of which the"fol-'lowingY is ya specification,A eference beingfhad therein fto theaccompanying Idrawings.

'In i the` construction of chucks, particularly vthat type'lused inconnection with 1 lathes andi millingiimachines, .it is the presthechuck heads so aste-expedite Amanufacture in connection-with each'an'dat the same timefail'ordperfect chuck jaw guides at all times withoutfthe necessity of discarding the chuck head.

' "My invention `is furthercharacterized'4 by afchuckYhaviiigradialvjaws adapted to"fhave movement {impar-ted theretofrom areciprocable` element," for instance, an l element pneu maticallyactuated, and the means employed for'articulating'the jc ws'relativeffto the reciprocablel element 'permits of 1 a Y maximumadjustment being made'f/ with a `minimum eX- penditure of power. vThisisf brought about by novel Vlj aw levers which have. the 'greater ypartthereof disposed 'tangentially relative to the reciprocable-.element' incontradi`stinction to levers entirely disposed'ata radius relative tothereciprocablef'element. 'L c Again, my invention residesV inthe novel iguide platefor Inasterand'face' chuck aws,

both of which mayA be I adjusted independentjly` off anymechanismemployed for` adj ustingall Vlof" the jawsinsynchronism.

Specification of Letters'A Patent.

'Patented Oct. a, i921.

inventionivill be better `understood from the following description inconnection Iwith the'fdrawing, wherein- :Figure l is alongitudinal"sectional view of the chuck; Y

Fig. 2:5is a cross sectional view of the same;

F ig.- isaan'end view of the chuck partly broken: away andpar'tly insection;

VFig. his a horizontal sectional view taken 'onthe' line IV-IV of F ig.2;

Fig, 5I is a longitudinal sectional view of arportion ofa modified formof chuck;

rFlg.V Gis an end view ofthe same;

'F'i'gzr 7 'isahorizontal sectional view `taken Y Fig; 8 Yis-an end viewofanother 'chuck in accordance with my invention;

Fig.A 91is a'longitudinalsectional view of a portion ofthe-same; and v Fig. l0 is a horizontal sectional view taken on the line X-"X ofFig. 8.v

LReference-vvillrst behad to Figs. 1" to l inclusive showing acylindrical chuck body that `isformed toprovide an innerwall l and acircumferentially disposed wall 2 which is set in'from'the marginaledges of the inner'wall l and provided with radially fdisposed sets ofbearings 3 for jaw pivot pins or trunnions 4L.

vThe inner -wall l of the chuck body has a concentric guide 5 andmounted aga-inst said 'wall is an end plate 6 which may be connected tothewalls l and 2 by a plurality of screwbolts 7 or other fasteningmeans. The-end plate`6 serves as anabutmentfor a piston `head 8 slidableinthe guide 5, and said piston head has a coupling sleeve 9 fora-recipr'ocable piston or operating rod (not shown); The piston head 8is provided with awide peripheralV groove l0 and said head is slidableon a 'guide-sleeve 11 axially of aV faceplate l2 forming part of a chuckhead 13 `which is fitted over the chuckfbo'dy and held in engagementtherewith by. a plurality ofscrew bolts 14 extending through the chuck.faceplate 12 into the walls 2 of the; chuck-body. The screw boltsVMare; also employed Vfor. retaininga circular removable guide platel5between the wall'2 and the Y for the shiftable jaws 18.

face plate 12, as best shown in Fig. l. By reference to Fig. 4, it willbe noted that the bearings 3, besides engaging the inner wall of thechuck head 13, engage the guide plate 15 andin consequence of thisconstruction, the guide plate is normally h-eld and braced within thechuck head.

The chuck face plate 12 is slotted, as at 16, to provide clearance forshiftable jaws 418,

and these jaws are shiftable in slots 19 andl 20 provided therefor inthe guide plate 15 and the chuck head 13 respectively.

The parallel walls of the guide plate slots 19 afford guides for theshiftable jaws 18 and extend into ,f grooves 21` provided thereforin theside walls of the shiftable jaws, while the inner ends of said jawsare-also grooved to receive the Vend wall of each of i the slots 19, asbest shown in Fig. 1. The

shiftable jaws 18 slide between the bearings 3 and stepped face jaws 22may be connected to the shiftable jaws 18 by transverse keys 23, screws24 or other fastening means.

The inner faces of the shiftable jaws 18 have notches 25 to'receive therock heads 26 of levers 27 supported by the pivot pins 4,

' said levers fitting between the bearings 3, as

best shown in Fig. 2. The inner ends of the levers 27 are offset andenter Vthe grooves 10 of the piston head 8, said levers having the innerends thereof disposed at atangent to the axis of the piston head andprovided with rock heads 28 within the groove 10, so that aVreciprocable movement `of-theV piston head 8 will impart a rockingmovement to the lever 27 and cause said levers to shift the jaws 18 in aradial direction to and from the axis of the chuck head. By having thelevers 27 disposed at a tangent to the piston head 8, incontradistinction to a radial disposition of said levers, a greaterdegree of leverage is obtained in moving the jaws 18 and it is in view0f this constructive arrangement- -of parts that a minimum amount ofpower may actuate the jaws 18.

Since the slotted guide plate 15 is seated within the chuck head 13against the face plate 12 thereof and braced .by the' wall 2, said guideplate is as though integral with the chuck head and affords positiveguides l However, should the guide plate be injured it is an extremelyeasy matter to remove said plate and substif tute another.- The guideplate'readily co- 55 operates with the face plate 12, the `head 13, andthe bearings 3 in firmly bracing the shiftable jaws 18 so that saidjawsmay be evenly shifted inl synchronism by the offset levers 27 andthe reciprocable piston 8. l

In Figs. 5, 6 yand 7, two slotted guide plates 29 are within Vthe chuckhead 30 and separated by a fillermember 31, which is also said chuckhead. These elements are main- -jaw part-33. i

jaws slidablegrelative to said body and head,

tained assembled by screw bolts 32, asshown fto the jaw part 33 by atongue 38 of said jaw-part extending into an annular groove 39 in thescrew 37. The part 33 is adapted to.. be shiftedina radial direction, asin the preferred form of construction, and it isY through the medi-umofthe screw37 that the jaw part 34 may befshifted relative to the Asimple form of chuck hasbeen shownV in'Figs. 8, 9 and 10,wher.ein 40denotes aV chuck body, 41 a slotted face plate42 a slotted'guide platefor jaws 43, and 44 rotatable screws supported by .the chuck body kandadapted for shifting the jaws 43, said screws being used in lieuv of thelever 27 previously referred to. The face plate 42 are Vheld relative tothe chuck body 40 by screw bolts 45, and this' simple constructivearrangement `of parts affords a durable chuck head fromgwhich the guideplate 42 may be removed, and another'substituted therefor when occasionso requires.V

Itis thought thatthe-operation and utilit of improvement will beapparent without further description, and Vwhile in the Asaid jawscompletely housed -within said chuck head. Y

2.' In avchuck, a Vchuck body having a face plate, jaws, andVdetachableunitary means housed within said chuck body against the faceplate thereof affording guides for said JELWS. j j '1 3. A chuckascharacterized in claim 2, wherein means carried by the face plate ofsaid chuck` body VVassists in correctly positioning said unitary means.l Y

4. Y In a chuck, a body, a head onjsaid body,

and a guide plate for said jaws positioned between said body and saidhead. Y Y f 5. A chuck as v.characterized in claim 4, whereinsaid headhas an axial guide on which said guide plateis mounted.

6. In a chuck, a body, a chuck headfonsaid body, jaws slidable relativeto said bodyrand head, a guide plate .for saidvjaws positioned plate 41and guide between said body and said head, a guide sleeve on said chuckhead extending through Y said guide plate, and re'oiprooable means eX-tendinginto said body and over the guide sleeve of said chuck headadapted to slide said jaws.

7. A chuck as characterized in claim 6, wherein an end plate on saidchuck body serves as an abutment for said reciprooable operating means,and said operating means 10 slides in said body independently of saidend plate.

In testimony whereof I aix my signature in the presence of tWoWitnesses.

JOSEPH F. BUHR.

Witnesses:

KARL H. BUTLER, ANNA M. Donn.

